42506279 has 2 divisors, whose sum is σ = 42506280. Its totient is φ = 42506278.

The previous prime is 42506267. The next prime is 42506281. The reversal of 42506279 is 97260524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42506279 - 2¹⁶ = 42440743 is a prime.

It is a Sophie Germain prime.

Together with 42506281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42506479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253139 + 21253140.

It is an arithmetic number, because the mean of its divisors is an integer number (21253140).

Almost surely, 2^42506279 is an apocalyptic number.

42506279 is a deficient number, since it is larger than the sum of its proper divisors (1).

42506279 is an equidigital number, since it uses as much as digits as its factorization.

42506279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 42506279 is about 6519.6839647333. The cubic root of 42506279 is about 348.9937875704.

The spelling of 42506279 in words is "forty-two million, five hundred six thousand, two hundred seventy-nine".